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  1. jimmbo

    Alpha drive for a V8 whats the ratio?

    I/O makers often offered an engine with more than one Ratio, to make it easier to Prop, over a larger variety of boats, mainly to reduce the number of Prop a dealer need to inventory, and to keep the Prop choices closer to where the Dia-Pitch relationship made for better Efficiency. Both Drives...
  2. jimmbo

    You will never guess what product removed creosote,Im stunned!!

    Pressure from the Repulsivican Party. Same way Aspertaine was approved after 35+ yrs of denial
  3. jimmbo

    You will never guess what product removed creosote,Im stunned!!

    No, I figure a few yrs off my life because of those Toxic Bug Potions is a Fair Trade to be Bug free, and therefore Malaria free
  4. jimmbo

    You will never guess what product removed creosote,Im stunned!!

    I know the stuff took all the Lettering off the buttons on one of my DSLRs. Makes it interesting when trying to operate that Camera
  5. jimmbo

    15W-40 oil is it multi purpose?

    I've used Volvo Synthetic and Royal Purple in my I/O, next change, will likely be VP Oil.
  6. jimmbo

    Correcting gear ratio with prop size

    You are asking a lot of a 5 liter on a 21 ft boat. It is not known for torque, and the Higher HP versions of the 5 Liter are even weaker in the Torque department. If you think that changing props is going to turn a Tugboat into a Hydroplane... Not gonna happen There is no such thing as a Speed...
  7. jimmbo

    Correcting gear ratio with prop size

    What is the Engine's WOT Rpm Range, and what is the top Rpm is it getting? Mercruiser or Volvo?
  8. jimmbo

    Looking for a fuel pump or kit (1967, 60 HP)

    Welcome to iboats sending you a Private Message
  9. jimmbo

    1984 J90 HP .060" over. Why not?

    Ball Hones are not good for 2 stokes, they can cause issues with the Ports. Same goes for Chamfering the Ports, doing so can make changes to the Port Timing, as well as cause other Damage
  10. jimmbo

    1996 Evinrude 40hp - Will not idle, 6mph WOT

    Can the spark, jump a 3/8" gap?
  11. jimmbo

    86 mercury 90 hp inline 6 started rattling at idle

    Welcome to iboats 'Heard a Noise, then it started rattling/knocking', is too Vague. A video with a clear rendering of the Noise(s) may help a bit...
  12. jimmbo

    1979 Merc 7.5hp oil mix

    Depending on which Gallon
  13. jimmbo

    1965 Mercury 35

  14. jimmbo

    Evinrude 9.5 vs 8hp speed test

    The 9.9, when it came out in 74, was probably putting out about 11 1/2 - 12 Hp, while the 15 was probably close to 15
  15. jimmbo

    1971 Evinrude fisherman, not pumping water

    I remember when it was J6J, and Chumpion has made some changes to how they scale the Plugs. I always preferred AC DelcoM4C as our Plug of choice. The 5 1/5, later becoming the 6hp, had a Thermostat, and was speced with J6J
  16. jimmbo

    1965 Mercury 35

    From the 1965 Brochure
  17. jimmbo

    1971 Evinrude fisherman, not pumping water

    Keep an eye on those 'Hotter Plugs', they could end up causing Detonation, as they won't shed Heat as well as the specified plug would When resealing the Lower Unit, don't forget about the Shift Shaft Seal, and the Washers under the Drain and Vent Screws
  18. jimmbo

    1964 Johnson 60HP V4 Carb adjustment

  19. jimmbo

    1965 Mercury 35

    Welcome to iboats You can use TCW-3 at 50:1 as that engine has Anti Friction Bearings throughout. So 16 oz of oil for 5 Imp Gallons or 6 US Gallons of gas
  20. jimmbo

    Evinrude 9.5 vs 8hp speed test

    There's an Apples to Apples Comparison
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